*118 The defendant, Jerome F. Moore, appeals from the judgment of the trial court denying his motion to correct an illegal sentence. On appeal, the defendant claims that the court incorrectly concluded that (1) the 2015 amendment to General Statutes § 21a-279 (a), which the legislature passed during a special session in June, 2015; see Public Acts, Spec. Sess., June, 2015, No. 15-2, § 1; does not apply retroactively to his sentence, 1 and (2) his five *699 year sentence does not violate the eighth amendment to the United States constitution *119 or article first, §§ 8 and 9, of the Connecticut constitution. We affirm the judgment of the trial court.

The following facts and procedural history are relevant to this appeal. On August 6, 2014, the defendant was arrested for possession of twenty-eight bags of heroin and charged with possession of narcotics in violation of § 21a-279 (a), and possession of narcotics with intent to sell in violation of General Statutes § 21a-278 (b). On the date of the offense, a violation of § 21a-279 (a) carried a sentence of imprisonment of up to seven years for a first offense. 2 See General Statutes (Rev. to 2013) § 21a-279 (a). Prior to the defendant's conviction and sentencing, but subsequent to his arrest, the legislature amended § 21a-279 (a), with an effective date of October 15, 2015, and reclassified a first offense of § 21a-279 (a) as a misdemeanor punishable by not more than one year of incarceration. See General Statutes (Supp. 2016) § 21a-279 (a).

Following a jury trial, on April 1, 2016, the defendant was found not guilty of possession of narcotics with intent to sell in violation of 21a-278 (b), but guilty of possession of narcotics in violation of § 21a-279 (a). On May 27, 2016, the court, Shah, J. , sentenced the defendant, pursuant to § 21a-279 (a), to a period of five years of incarceration.

On June 8, 2016, the defendant filed a motion to correct an illegal sentence. On August 23, 2016, defense counsel filed an amended motion to correct an illegal sentence and a supporting memorandum of law, claiming that the defendant's five year sentence exceeded the statutory maximum set forth in § 21a-279 (a), as *120 amended by Spec. Sess. P.A. 15-2 (2015 amendment). On the same day, the court heard arguments on the amended motion.

On September 16, 2016, the court denied the defendant's motion to correct an illegal sentence, finding, inter alia, that (1) "there is no language in either the public act or its legislative history indicating a clear intent to apply the amendment retroactively" and (2) the sentence did not violate the defendant's right against excessive and disproportionate punishment under the federal and state constitutions. This appeal followed.

On appeal, the defendant claims that the court improperly denied his motion to correct an illegal sentence because (1) the legislature expressed its intent that the 2015 amendment applies retroactively; and (2) following the amendment to § 21a-279 (a), his sentence now constitutes excessive and disproportionate punishment in violation of the state and federal constitutions. "We review claims that the court improperly denied the defendant's motion to correct an illegal sentence under an abuse of discretion standard." State v. Pagan , 75 Conn. App. 423 , 429, 816 A.2d 635 , cert. denied, 265 Conn. 901 , 829 A.2d 420 (2003). We address each claim in turn.

I

The defendant first claims that his five year sentence exceeds the statutory maximum *700 set forth in § 21a-279 (a) because the legislature expressed its intent that the 2015 amendment applies retroactively. He claims, as well, that by reason of the rule of amelioration, the statute should be applied retroactively. We are not persuaded. 3 *121 Whether, as a matter of statutory interpretation, the 2015 amendment may be applied retroactively to crimes committed before its effective date of October 1, 2015, is a question of law over which our review is plenary. See State v. Kalil , 314 Conn. 529 , 552, 107 A.3d 343 (2014) ; see also State v. Jackson , 153 Conn. App. 639 , 643, 103 A.3d 166 (2014) ("Whether a statute is to be applied retroactively is a question of statutory construction.... Issues of statutory construction raise questions of law, over which we exercise plenary review." [Citation omitted; internal quotation marks omitted.] ), cert. denied, 315 Conn. 912 , 106 A.3d 305 (2015).

"In criminal cases, to determine whether a change in the law applies to a defendant, we generally have applied the law in existence on the date of the offense, regardless of its procedural or substantive nature." (Internal quotation marks omitted.) State v. Kalil , supra, 314 Conn. at 552 , 107 A.3d 343 ; accord In re Daniel H. , 237 Conn. 364 , 377, 678 A.2d 462 (1996). "This principle is derived from the legislature's enactment of savings statutes such as General Statutes § 54-194, which provides that '[t]he repeal of any statute defining or prescribing the punishment for any crime shall not affect any pending prosecution or any existing liability to prosecution and punishment therefor, unless expressly provided in the repealing statute that such repeal shall have that effect,' and General Statutes § 1-1 (t), which provides that '[t]he repeal of an act shall not affect any punishment, penalty or forfeiture incurred before the repeal takes effect, or any suit, or prosecution, or proceeding pending at the time of the repeal, for an offense committed, or for the recovery of a penalty or forfeiture incurred under the act repealed.' " State v. Kalil , supra, at 552, 107 A.3d 343 . "It is obvious from the clear, unambiguous, plain language of the savings statutes that the legislature intended that [defendants] be prosecuted and sentenced in accordance with *122 and pursuant to the statutes in effect at the time of the commission of the crime. Our courts have repeatedly held that these savings statutes preserve all prior offenses and liability therefor so that when a crime is committed and the statute violated is later amended or repealed, defendants remain liable under the revision of the statute existing at the time of the commission of the crime." (Internal quotation marks omitted.) State v. Jackson , supra, 153 Conn. App. at 644-45 , 103 A.3d 166 .

"We will not give retrospective effect to a criminal statute absent a clear legislative expression of such intent.... When the meaning of a statute initially may be determined from the text of the statute and its relationship to other statutes ... extratextual evidence of the meaning of the statute shall not be considered.... When the meaning of a provision cannot be gleaned from examining the text of the statute and other related statutes without yielding an absurd or unworkable result, extratextual evidence may be consulted *701 .... Thus ... every case of statutory interpretation ... requires a threshold determination as to whether the provision under consideration is plain and unambiguous. This threshold determination then governs whether extratextual sources can be used as an interpretive tool.... [T]he fact that ... relevant statutory provisions are silent ... does not mean that they are ambiguous.... [O]ur case law is clear that ambiguity exists only if the statutory language at issue is susceptible to more than one plausible interpretation." (Citations omitted; internal quotation marks omitted.) Id., at 643-44, 103 A.3d 166 .

The defendant argues that extratextual evidence should be considered in the present case because a "plain language reading of [the statute] results in an absurd and unworkable result." Specifically, the defendant asserts that Spec. Sess. "P.A. 15-2, § 1, was a budget *123 implementing bill and the legislature has a constitutional duty to pass a balanced budget." He further contends that "[i]t would be absurd to conclude that the legislature would vote to approve this budget implementing bill knowing that the projected fiscal savings in the bill would not be realized ...." We disagree.

We begin with the "threshold determination as to whether the provision under consideration is plain and unambiguous." State v. Jackson , supra, 153 Conn. App. at 643 , 103 A.3d 166 , 103 A.3d 166 . The effective date of the 2015 amendment is October 1, 2015. See Public Acts, Spec. Sess., June, 2015, No. 15-2, § 1 (section "21a-279 of the general statutes is repealed and the following is substituted in lieu thereof [Effective October 1, 2015] ...."). The amendment contains no express statement that it applies retroactively. Its silence in this regard, however, does not render it ambiguous. Rather, the absence of any language stating that the amendment applies retroactively indicates that the legislature intended the amendment to apply prospectively only. See State v. Kalil , supra, 314 Conn. at 558 , 107 A.3d 343 ; General Statutes §§ 54-194 and 1-1 (t).

Additionally, the legislature knows how to make a statute apply retroactively when it intends to do so. See State v. Kevalis , 313 Conn. 590 , 604, 99 A.3d 196 (2014) ("it is a well settled principle of statutory construction that the legislature knows how to convey its intent expressly" [internal quotation marks omitted] ). Thus, if the legislature had intended the 2015 amendment to apply retroactively, it could have used clear and unequivocal language indicating such an intent. It did not do so. A prospective only application of the statute is consistent with our precedent and the legislature's enactment of the savings statutes; see State v. Kalil , supra, 314 Conn. at 552 , 107 A.3d 343 ; and, therefore, the statutory language is not susceptible to more than one plausible interpretation. See State v. Jackson , supra, 153 Conn. App. at 644 , 103 A.3d 166 . Because there is no ambiguity in the 2015 *124 amendment, we need not look to its legislative history to ascertain the legislature's intent. 4 We conclude that the court correctly determined *702 that the 2015 amendment does not apply retroactively to the defendant's sentence.

We also reject the defendant's argument that we should adopt the amelioration doctrine and apply it to his sentence. "The amelioration doctrine provides that amendments to statutes that lessen their penalties are applied retroactively." (Internal quotation marks omitted.) State v. Kalil , supra, 314 Conn. at 552 , 107 A.3d 343 . Our Supreme Court expressly has declined to establish that ameliorative changes to criminal statutes apply retroactively, finding that "the doctrine is in direct contravention of Connecticut's savings statutes." (Footnote omitted.) Id., at 553, 107 A.3d 343 . We are bound by this precedent.

On the basis of the foregoing, we conclude that, in the absence of legislative intent that the 2015 amendment *125 applies retroactively, the defendant properly was sentenced pursuant to the statute in effect on the date of the offense for which he was convicted.

II

The defendant next claims that his five year sentence constitutes an excessive and disproportionate punishment in violation of the eighth amendment to the United States constitution and article first, §§ 8 and 9, of the Connecticut constitution. Specifically, the defendant asserts that his "sentence is no longer graduated to the offense" because Spec. Sess. "P.A. 15-2, § 1, and its surrounding legislative history express a change in criminal justice policy in this state, namely, that incarcerating rather than treating drug-dependent individuals no longer comports with our evolving standards of decency." In response, the state claims that the court properly denied the defendant's motion to correct because he failed to establish that his punishment was unconstitutional. The state further argues that this court should not review the defendant's state constitutional claim because he failed to adequately brief the claim under the well established Geisler 5 analysis. We agree with the state.

"Our review of the defendant's constitutional claims is plenary." (Internal quotation marks omitted.) State v. Rivera , 177 Conn. App. 242 , 252, 172 A.3d 260 (2017) ; see also State v. Taylor G. , 315 Conn. 734 , 741, 110 A.3d 338 (2015) ("[a] challenge to [t]he constitutionality of *126 a *703 statute presents a question of law over which our review is plenary" [internal quotation marks omitted] ).

A

We first address the state's argument that the defendant's constitutional claim under article first, §§ 8 and 9, of the Connecticut constitution is inadequately briefed. Specifically, the state argues that the defendant failed to analyze his claim pursuant to the Geisler factors, and instead analyzed his claim under a two factor analysis set forth in State v. Santiago , 318 Conn. 1 , 122 A.3d 1 (2015). The defendant maintains that, following Santiago , "[a] reviewing court engages in a two stage analysis in determining whether a challenged punishment is unconstitutionally excessive and disproportionate.... First, the court looks to 'objective factors' to determine whether the punishment at issue comports with contemporary standards of decency.... [Second, the] court must [then] decide whether the constitution permits imposition of the defendant's ... sentence." We agree with the state that Geisler controls, and accordingly, we conclude that the defendant's state constitutional claim is inadequately briefed.

"It is well established that federal constitutional law establishes a minimum national standard for the exercise of individual rights and does not inhibit state governments from affording higher levels of protection for such rights.... In several cases, our Supreme Court has concluded that the state constitution provides broader protection of individual rights than does the federal constitution.... It is by now well established that the constitution of Connecticut prohibits cruel and unusual punishments under the auspices of the dual due process provisions contained in article first, §§ 8 and 9. Those due process protections take as their hall-mark principles of fundamental fairness rooted in our *127 state's unique common law, statutory, and constitutional traditions.... Although neither provision of the state constitution expressly references cruel or unusual punishments, it is settled constitutional doctrine that both of our due process clauses prohibit governmental infliction of cruel and unusual punishments." (Citations omitted; internal quotation marks omitted.) State v. Rivera , supra, 177 Conn. App. at 252-53 , 172 A.3d 260 . "In ascertaining the contours of the protections afforded under our state constitution, we utilize a multifactor approach that we first adopted in [ Geisler ]." State v. Santiago , 319 Conn. 935 , 937 n.3, 125 A.3d 520 (2015). See footnote 5 of this opinion.

We reject the defendant's argument that our Supreme Court, in State v. Santiago , supra, 318 Conn. at 1 , 122 A.3d 1 , abandoned the Geisler analysis for claims of cruel and unusual punishment and instead broadly adopted a two part test. Our review of Santiago does not support the defendant's interpretation. Contrary to the defendant's assertions, in Santiago , the Supreme Court did analyze the defendant's state constitutional claim pursuant to the Geisler factors. 6 See State v. Santiago , supra, at 17-46, 122 A.3d 1 . We therefore *704 conclude that Geisler still controls. We note, as well, that this court recently has applied the Geisler factors to a claim of cruel and unusual punishment, and we are bound by this court's precedent. See *128 State v. Rivera , supra, 177 Conn. App. at 251-75 , 172 A.3d 260 (analyzing, pursuant to Geisler factors, defendant's claim that "mandatory minimum sentence of twenty-five years of incarceration without the possibility of parole imposed on a juvenile homicide offender" constitutes cruel and unusual punishment).

Absent from the defendant's discussion of his state constitutional claim is an independent analysis of the Geisler factors. Accordingly, we deem abandoned his claim under the state constitution, and we decline to review it. See State v. Bennett , 324 Conn. 744 , 748 n.1, 155 A.3d 188 (2017) ("The defendant has asserted various claims under both the state and federal constitutions, but he has not provided an independent analysis of the former in accordance with ... Geisler .... Therefore, we deem abandoned any state constitutional claims." [Citation omitted.] ); see also Morrissey-Manter v. Saint Francis Hospital & Medical Center , 166 Conn. App. 510 , 526-27, 142 A.3d 363 (claim inadequately briefed on appeal deemed abandoned and court declined to review it), cert. denied, 323 Conn. 924 , 149 A.3d 982 (2016).

B

We next address the defendant's argument that his sentence is excessive and disproportionate in violation of the eighth amendment to the United States constitution. The defendant argues that his sentence violates the eighth amendment because it "is out of step with our contemporary standards of decency and serves no penological purpose," given the change in criminal justice policy following the enactment of the 2015 amendment. We are unpersuaded. 7

*129 "[T]he eighth amendment [to the United States constitution] mandates that punishment be proportioned and graduated to the offense of conviction." State v. Santiago , supra, 318 Conn. at 20 , 122 A.3d 1 . "The eighth amendment's prohibition against cruel and unusual punishment is made applicable to the states through the due process clause of the fourteenth amendment to the United States constitution.... [T]he United States Supreme Court has indicated that at least three types of punishment may be deemed unconstitutionally cruel ... [including] excessive and disproportionate punishments." (Citation omitted; internal quotation marks omitted.) Dumas v. Commissioner of Correction , 168 Conn. App. 130 , 135-36, 145 A.3d 355 , cert. denied, 324 Conn. 901 , 151 A.3d 1288 (2016).

In addressing an eighth amendment claim, "[a] reviewing court engages in a two stage analysis [to determine] whether a challenged punishment is unconstitutionally excessive and disproportionate *705 .... First, the court looks to objective factors to determine whether the punishment at issue comports with contemporary standards of decency.... [This includes] the historical development of the punishment at issue, legislative enactments, and the decisions of prosecutors and sentencing juries." (Citations omitted; internal quotation marks omitted.) State v. Santiago , supra, 318 Conn. at 21 , 122 A.3d 1 . Second, "courts must ... bring their own independent judgments to bear, giving careful consideration to the reasons why a civilized society may accept or reject a given penalty.... Although the judgments of legislatures, juries, and prosecutors weigh heavily in the balance, it is for [the court] ultimately to judge whether the [constitution] permits imposition of the ... penalty .... This analysis necessarily encompasses the question of whether the penalty at issue *130 promotes any of the penal goals that courts and commentators have recognized as legitimate: deterrence, retribution, incapacitation, and rehabilitation.... A sentence materially lacking any legitimate penological justification would be nothing more than the gratuitous infliction of suffering and, by its very nature, disproportionate." (Citations omitted; footnote omitted; internal quotation marks omitted.) Id., at 22-23 , 122 A.3d 1 .

The defendant first asserts that his five year sentence no longer comports to contemporary standards of decency. See id., at 21 , 122 A.3d 1 . In support of this claim, the defendant relies primarily on the legislative history surrounding the 2015 amendment and remarks made by the governor about how the 2015 amendment indicates a "systematic change" in the treatment of those convicted of minor possession offenses.

The defendant's focus on the remarks of our legislators does little to support his claim. It bears repeating that the legislature knows how to make the application of a statute retroactive when it wants to do so. See State v. Kevalis , supra, 313 Conn. at 604 , 99 A.3d 196 . It necessarily follows that if the legislature had felt that "extended periods of incarceration are no longer necessary or appropriate forms of punishment for nonviolent drugs offenders," or that a sentence of greater than one year for a first violation of § 21a-279 (a) constituted "cruel and unusual punishment," as the defendant argues, the legislature would have so indicated by making the statute apply retroactively. It did not do so. See part I of this opinion. Further undercutting the defendant's reliance on our legislators' comments is the fact that our legislature enacted the savings statutes, §§ 54-194 and 1-1 (t), to ensure "that [defendants] be prosecuted and sentenced in accordance with and pursuant to the statutes in effect at the time of the commission of the crime.... [T]hese savings statutes preserve all prior offenses and liability therefor so that when a crime is *131 committed and the statute violated is later amended or repealed, defendants remain liable under the revision of the statute existing at the time of the commission of the crime." (Internal quotation marks omitted.) State v. Jackson , supra, 153 Conn. App. at 644-45 , 103 A.3d 166 .

Furthermore, as the court noted in its memorandum of decision, "contrary to the defendant's assertions, neither [Spec. Sess.] P.A. 15-2 nor its legislative history indicate that a five year prison sentence for possession of narcotics imposed based on a persistent history of drug offenses and a failure to complete probation is 'disproportionate and excessive ... [as] judged by the contemporary, evolving standards of decency that mark the progress of a maturing society.' " We agree. As the defendant concedes, many jurisdictions still treat simple possession as a felony. Further, the 2015 revision to § 21a-279 (a) still permits a defendant to be charged *706 with a felony in certain circumstances. See General Statutes (Supp. 2016) § 21a-279 (a) (3). Thus, the defendant has failed to demonstrate that his sentence no longer comports to contemporary standards of decency using objective indicia such as "the historical development of the punishment at issue, legislative enactments, and the decisions of prosecutors and sentencing juries." (Internal quotation marks omitted.) State v. Santiago , supra, 318 Conn. at 21 , 122 A.3d 1 .

The defendant also has failed to demonstrate that his five year sentence serves no legitimate penological justification. Although the defendant argues that his sentence offers no deterrent value to others who will now receive a maximum sentence of up to one year incarceration for the same offense, he fails to adequately rebut other recognized penological purposes-retribution, incapacitation, and rehabilitation. 8 See State v. Santiago , supra, 318 Conn. at 22 , 122 A.3d 1 .

*132 On the basis of the foregoing, we conclude that the court properly found that the defendant failed to demonstrate that his five year sentence for a violation of § 21a-279 (a) is disproportionate and excessive in violation of the eighth amendment to the United States constitution. Accordingly, the court did not abuse its discretion in denying the defendant's motion to correct an illegal sentence.

The judgment is affirmed.

In this opinion the other judges concurred.